Pen



FIG. 1 is a front right perspective view of a pen showing my new design;

FIG. 2 is a rear left perspective view thereof;

FIG. 3 is a bottom right perspective view thereof;

FIG. 4 is a bottom left perspective view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof;

FIG. 9 is a front view thereof; and,

FIG. 10 is a rear view thereof. 

CLAIM The ornamental design for a pen, as shown. 